Improved lathe-chuck



tnitritatre lgatrnt @fitta JOHN OOONNOB., OF BUFFALO, NEW YORK, ASSIGNORTO IIIMSELF AND E. M. KETCI-IUM, OF THE SAME PLAGE.

Letters .Patent No. 69,577, dated October 8, 1867.

IMPROVBD LATER-CHUCK.

tithe rtcmle referat tn' in tipa tetttrs glntrut mit uniting ont et tigesmut.

TO ALL WIIOM IT MAY CONCERN:

Be it known that I, JOHN O CONNOR, of the city of Buialo, in the countyof Eric, and State of New York, (assigner to myself and E. M. Ketchum,of the same place,) have invented a certain new and improved Bolt-Oentring Chuck for Lathes; and I do hereby declare that the following isa. full and exact description thereof, reference being had to theaccompanying drawings, making a part of this specification, in which-Figure I is a Vertical section of my improvement.

Figure II is a side elevation of the same in working position upon alathe.

Figure III is a vertical section of a modification of my improvement.

Figure IV is a top plan, view of the same.

The nature of this .invention relates to the construction of a devicefor holding round or square bolts or rods, and presenting their ends tothe action of a centring tool upon the main spindle of n lathe, andconsists of two horizontal jaws, which may be moved up or down, asrequired, by means of a screw passing vertically through the same, whichscrew is supported withinA a vertically adjustable box or frame, thewhole device being firmly connected to the saddle-plate of theslide-rest of a lathe,

Letters of like name and kind refer to like parts in each of thefigures.

A represents an L-shaped bracket, which is secured to the top ot' thesaddle-plate of the slide-rest of a lathe in the same manner as thetool-stock, t-he latter being removed for that purpose. B represents anoblong box or frame, which is fitted against the perpendicular face ofthe bracket in such manner that it may be moved up or down upon saidface, and adjusted at any required height by means of the screw-shank c,passing through the slot a 'made in the bracket, and provided with awasher and nut, c', upon its end. D D represent two sliding jaws orclamp blocks, projecting horizontally from the open face of the box orframe B, their Shanks, d2, being fitted into the box in suoli mannerthat they allow their moving up or down, but not sidewise or rocking. Aright-and-left screw, E, having bearings in the top and bottom of thebox B, passes through the shanks of both blocks, one-half of such screw,having a right-hand thread, passing through and operating the upperblock, andthe other half, having a left-hand thread, operating the lowerblock. Hence, when the screw E is revolved, by means of the crank E upon.the top, or a hand-wheel or equivalent device, in one direction, theclamping blocks will approach each other, and if in the oppositedirection, they will recede from each other. The under side of the upperblock and the upper side of the lower one are provided with scmicirculargrooves f j", which, when both blocks are brought into close contact,together form a horizontal circular opening. The edges of these groovesare made exactly parallel with each other, so that a round bar or rod,of a diameter larger than that of the grooves, may be placed andsecurely held between said edges in a horizontal position.

The operation of my improvement is substantially as fellows: Thetool-stock being removed from the saddle-plate of the slide-rest oftheilathe, the centring-chuck is placed upon and secured to the latterin alike manner. Then the bolt or b ar which requires `to be centred isplaced between the clamping blocks and laid in the groove f. The crank Ebeing turned so as to cause the blocks to approach each other, the boltmay now be firmly clamped between them, and held in a. horizontalposition. Then, by moving the bracket A towards the centre of the lathe,and by raising or lowering the box or frame until the centre of the boltor rod is precisely in line with the centre of the main driving-spindleof the lathe, the chuck may be adjusted in proper working position.After the chuck has been thus adjusted, the whole slide-rest is moved byany common or convenient-manner sidewise, so as to present the end ofthebolt or rod to the action of the ccntring-tool g. One end of the rodbeing centred, a single turn of the crank E will release the rod, theother end of which may be presented to the centring-tool in a likemanner. j Y

By a slight modification in the construction of my improved' chuck itmay be used for a variety of other purposes. The most important of theseis the holding bars for milling out jaws For this purpose therightand-left screw E is removed, and replaced by a right-hand screw, L,which operates only one of the clamping blocks, the other one being madeloose upon the screws. Two bars, h It are then placed between theblocks, projecting upon one side of the box or frame B, and betweenthese projecting ends the bar or jaw to be milled is secured by means ofa bolt, j, clamping the blocks B together', holes z' being made in theends of the blocks for that purpose. This modification is represented inFigs. III and IV, together with a top view of a portion of a -lathe andthe milling-tool, clearly exhibiting its operation.

What I claim as my invention, and desire to secure by Letters Patent,is-

A. bolt ccntring-chuck for lathes, constructed,arranged, and operatingin the manner and for the purpose iubsiantially as herein described.

JOIIN O'CONNOR.

Witnesses:

B. II. MUEHLE, Enw. WILHELMi

